- A Treatise Concerning the Principles of Human Knowledge
- The Indolence of the Filipino
- Thus Spake Zarathustra
- Rollo's Philosophy. [Air]
- Notes from the Underground
- The Unseen World and Other Essays
- The Mechanism of the Human Voice
- De profundis
- Politics: A Treatise on Government
- A Treatise of Human Nature
- Ethics — Part 1
- Poetics. English
- Catherine De Medici
- The Critique of Practical Reason
- The Prince
- The Republic
- The Uncollected Writings of Thomas de Quincey—Vol. 1
- The Ruins, or, Meditation on the Revolutions of Empires and the Law of Nature
- The Philosophy of Spinoza
- The Preface to Aristotle's Art of Poetry
- The Young Woman's Guide
- Ethics — Part 2
- The Child at Home
- Probabilities : An aid to Faith
- The Philosophy of the Moral Feelings
- A Lie Never Justifiable
- Civil Disobedience
- An Essay on the Principle of Population
- Dialogues Concerning Natural Religion
- The Consolation of Philosophy
- Siouan Sociology
- Filosofía Fundamental, Tomo II
- Protagoras
- The Composition of Indian Geographical Names
- The Composition of Indian Geographical Names
- Chinese Literature
- Searchlights on Health: Light on Dark Corners
- Reflections; or Sentences and Moral Maxims
- How to Marry Well
- Pedagogics as a System
- In Praise of Folly
- The Destiny of Man
- 道德经
- Le positivisme anglais
- El Criterio
- Book of Wise Sayings
- The Ego and His Own
- The Map of Life
- The Memorable Thoughts of Socrates
- A Essay Towards a New Theory of Vision
- Utilitarianism
- The Soul of Man under Socialism
- Filosofía Fundamental, Tomo IV
- Homer and Classical Philology
- A Philosophical Dictionary, Volume 10
- The Ethics of Aristotle
- History, Manners, and Customs of the North American Indians
- Heart's-ease
- Old-Fashioned Ethics and Common-Sense Metaphysics
- An American Girl Abroad
- Ethics — Part 4
- Statesman
- Apology, Crito, and Phaedo of Socrates
- How To Behave: A Pocket Manual of Republican Etiquette, and Guide to Correct Personal Habits
- Ethics — Part 5
- Auguste Comte and Positivism
- The Ethics of Drink and Other Social Questions
- Querist
- Essays
- An Enquiry Concerning Human Understanding
- The Friendships of Women
- Social Rights and Duties, Volume I (of 2)
- The Metaphysical Elements of Ethics
- Letters to His Son on the Art of Becoming a Man of the World and a Gentleman, 1753-54
- Beyond Good and Evil
- The Golden Sayings of Epictetus
- Essays
- The Conflict with Slavery, Part 1, from Volume VII,
- Among My Books
- Discourse of the Life and Character of the Hon. Littleton Waller Tazewell
- The Philosophy of Evolution
- Laws
- Improvement of the Understanding
- Shorter Prose Pieces
- Ethics — Part 3
- Apology
- The Theological Tractates and The Consolation of Philosophy
- Myths and myth-makers
- Categoriae. English
- A Philosophical Dictionary, Volume 1
- Fundamental Principles of the Metaphysic of Morals
- 淮南子
- The Existence of God
- Philosophie de la Liberté (Tome I)
- The Dark House
- The Critique of Pure Reason
- The Philosophy of the Conditioned
- Ancient and Modern Celebrated Freethinkers
- Walden
- The Physiology of Marriage, Part 2